import requests
from lxml import html

url = 'http://www.zcool.com.cn/work/ZMjc3NzAxOTI=/2.html'
page = requests.Session().get(url)
## 乱么解决方案1
page.encoding = "gbk"
## 乱码解决方案2
# html_text = str(page.content, 'gbk')
# print(html_text)
tree = html.fromstring(page.text)
result = tree.xpath('//img[@class="no-right-key"]//@src')
result = tree.xpath('//img[@class="no-right-key"]//test()')
print(result)